I use the P & O ferry from Hull to Zeebrugge. The journey is fine but the best piece of advice i can give is take some of your own ratchet straps. All we were supplied was some blue rope from P & O. The crossing was a little rough and in the morning all the rope had come undone. Luckily the straps i took kept the bike upright.

I love the Euro Tunnel, I just love it. I think every time I've used it I've pulled up, self checked in, and it's offered me the next crossing, no extra charge. I went last year on it at end of July, returned start of August, £70 return. I think that's pretty good. I've never had to queue up as long as I have for a ferry. No fannying about with strapping your bike down. No dicking about getting valuables etc and carrying them around for 2hours. No having to remember how to get back to you deck where your bike is. (and just for me, no sea sickness!)

Only downside for bike riders is there's no seating and the floors are obviously dirty, and not much to look at - still, it's only 30minutes or so.

Eurotunnel
I'm only going down as far as Paris but I've never taken the bike abroad at all! I'd heard bad stories of bikes falling over on eurotunnel and also on the ferrys as well. I'll probably opt for the eurotunnel this time seems so much easier, just hope I can remember to stay on the right (wrong) side of the road!

falling
I've never seen a bike topple over on the tunnel. Worst that happened to me was a harley rider with an alarm that kept going off because of the motion. You have to park in gear on the tunnel train, and as a result same harley rider promptly fired it up straight into the back of me!

Euro tunnel
We are going to Italy 1st week Aug,£70 rtn.Liverpool to Ashford,35min tunnel then Reims for the night.Personal choice,but I would rather stay with my bike.Its the only one I have..lol.so feel better knowing Im there to watch it..
Have a great trip